The burner on an electric stove has a power output of 2.0 kW. A 650 g stainless steel tea kettle is filled with 20∘C water and placed on the already hot burner. If it takes 2.70 min for the water to reach a boil, what volume of water, in cm^3, was in the kettle?

The  value is    

Explanation:

From the question we are told that

  The  power output is  

   The  mass of the steel is  

    The  temperature of the water is

     The  time take is  

Generally the quantity of heat energy given out by the  electric stove is mathematically represented as

=>    

=>    

This energy can also be mathematically represented as

Here   is the specific heat of stainless steel with value  

 tex]c_s[/tex] is the specific heat of water  with value  

  m_w is the mass of water which is mathematically represented as

=>  

So

converting to

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide